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Debt (Schedule of Extinguishment of Debt - Exchange Offers) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Feb. 07, 2018	Dec. 31, 2017	Sep. 30, 2017	Jan. 05, 2017	Dec. 31, 2012
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 721.8
Debt Instrument, Repurchase Amount	771.2
8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	237.6
Debt Instrument, Repurchase Amount	256.8
6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	328.0
Debt Instrument, Repurchase Amount	354.7
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount							$ 194.1
Debt Instrument, Repurchase Amount							204.5
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	237.6		$ 55.0	$ 182.6		$ 200.4	54.6
Debt Instrument, Face Amount									$ 500.0
Debt Instrument, Repurchase Amount							60.1
Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	328.0		$ 71.4		$ 256.6	229.9	100.1
Debt Instrument, Face Amount									900.0
Debt Instrument, Repurchase Amount							105.1
Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	156.2	$ 156.2				413.3	39.4
Debt Instrument, Face Amount									$ 1,500.0
Debt Instrument, Repurchase Amount		$ 159.7					$ 39.3
Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 332.0					$ 332.0
Exchange Offers [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								$ 332.5
Exchange Offers [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								81.7
Exchange Offers [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								69.4
Exchange Offers [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								181.4
Exchange Offers [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								649.5
Debt Instrument, Repurchase Amount								664.5
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								145.8
Debt Instrument, Repurchase Amount								163.3
Exchange Offers [Member] | Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								81.6
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								129.8
Debt Instrument, Repurchase Amount								138.7
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020 exchanged for 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								69.3
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								373.9
Debt Instrument, Repurchase Amount								362.5
Exchange Offers [Member] | Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								181.1
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 332.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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